Remove warning about a deprecated accessibility API (flutter/engine#3837)

engine/src/flutter/shell/platform/android/io/flutter/view/AccessibilityBridge.java

@@ -61,6 +61,7 @@ class AccessibilityBridge extends AccessibilityNodeProvider {
     }
 
     @Override
+    @SuppressWarnings("deprecation")
     public AccessibilityNodeInfo createAccessibilityNodeInfo(int virtualViewId) {
         if (virtualViewId == View.NO_ID) {
             AccessibilityNodeInfo result = AccessibilityNodeInfo.obtain(mOwner);